class Solution {
public:
    int maxTurbulenceSize(vector<int>& nums) {
        int n = nums.size();
        vector<int> f(n,1);
        vector<int> g(n,1);
        int ret=1;
        for(int i=1;i<n;i++)
        {
            if(nums[i-1]>nums[i])
                g[i] = f[i-1]+1;
            if(nums[i-1]<nums[i])
                f[i] = g[i-1]+1;
            ret = max(ret,max(f[i],g[i]));
        }
        return ret;
    }
};